as far as the placement of the accu-rite..here's how i have mine...
it is velcro'd to the back glass in the middle...
this pic above also shows my whole set up...identical hides on both ends (warm side is the left half, cool side is the right half. left side hide box and water dish are both directly over the heat pad which is underneath the whole terrarium.)
the cord hanging off the left side of the dresser is actually the cord for the thermostat's probe. the thermostat unit itself is actually up resting on the top of the terrarium.
oh and if you notice 1 side of the terrarium is elevated, that's so there's some ventilation for the heat pad and it keeps the heat pad off the surface of my dresser.
a close up showing where the accu-rite is...
there's also 2 water dishes cuz i found i can maintain humidity better with 2 water sources, whereas 1 water source doesnt provide enough moisture. plus, i know there's plenty of water for my girl & i spend less time refilling water dishes with 2 in there.
oh and um i didnt read enough of the thread to know if this got addressed or not so sorry if it already did but i noticed you said something like you can prevent a burn by placing more substrate over the side with the heat pad under it...and my take on that is no you cant cuz all the snake has to do at that point is move the substrate aside, which they do, mine does, and voila! you've got a burned snake.
ok so yeah, i think i've got a really good set up so that should give you an idea of what you could do but everyone sorta does their own thing.
whatever works for each of us right?